diff options
Diffstat (limited to 'ext/standard/float_to_double.c')
| -rw-r--r-- | ext/standard/float_to_double.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/ext/standard/float_to_double.c b/ext/standard/float_to_double.c new file mode 100644 index 0000000000..5aff1fe9c4 --- /dev/null +++ b/ext/standard/float_to_double.c @@ -0,0 +1,55 @@ +/* + +----------------------------------------------------------------------+ + | PHP Version 5 | + +----------------------------------------------------------------------+ + | Copyright (c) 2006-2014 The PHP Group | + +----------------------------------------------------------------------+ + | This source file is subject to version 3.01 of the PHP license, | + | that is bundled with this package in the file LICENSE, and is | + | available through the world-wide-web at the following url: | + | http://www.php.net/license/3_01.txt | + | If you did not receive a copy of the PHP license and are unable to | + | obtain it through the world-wide-web, please send a note to | + | license@php.net so we can mail you a copy immediately. | + +----------------------------------------------------------------------+ + | Authors: Keyur Govande <kgovande@gmail.com> | + +----------------------------------------------------------------------+ +*/ + +#include <float.h> +#include "float_to_double.h" +#include "main/snprintf.h" + +#define MAX_BUF_LEN 255 + +#ifndef FLT_DIG +# define FLT_DIG 6 +#endif + +/* + * Convert from a 4-byte float to a 8-byte decimal by first converting + * the float to a string, and then the string to a double. + * The decimals argument specifies the precision of the output. If decimals + * is less than zero, then a gcvt(3) like logic is used with the significant + * digits set to FLT_DIG i.e. 6. + */ +double float_to_double(float fp4, int decimals) { + char num_buf[MAX_BUF_LEN]; /* Over allocated */ + + if (decimals < 0) { + php_gcvt(fp4, FLT_DIG, '.', 'e', num_buf); + } else { + php_sprintf(num_buf, "%.*f", decimals, fp4); + } + + return zend_strtod(num_buf, NULL); +} + +/* + * Local variables: + * tab-width: 4 + * c-basic-offset: 4 + * End: + * vim600: noet sw=4 ts=4 fdm=marker + * vim<600: noet sw=4 ts=4 + */ |